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Retrieving data from SharePoint SOAP Requests using LINQ

Wednesday, May 13th, 2009

As I have been doing quite a bit of work with the SharePoint web services I recently came across an interesting issue related to querying SOAP XML, and specifically in SharePoint. This issue also applies to other SOAP requests, and XML requests in general that have Namespace prefixes.

The issue arises while trying to do a very common LINQ query such as the following:
var lists = from list in doc.Descendants("List")
select
new SharePointList
{
Description = list.Attribute("Description").Value,
Id = list.Attribute("ID").Value,
Title = list.Attribute("Title").Value
};

I was positive that my query was correct, but it was continually returning 0 results.

Enter the world of namespacing. I assumed that because the List element was not specifically prefixed that it would not matter, but I was wrong.

From a few levels above, in this example the element was GetListCollectionResponse, there was a namespace declared which was http://schemas.microsoft.com/sharepoint/soap/.

You cannot simply add the namespace with a colon in LINQ because it is an invalid element name.

You need to declare a specific XMLNamespace element like so:
XNamespace s = "http://schemas.microsoft.com/sharepoint/soap/";

Then, modify the above query to change the doc.Descendants element to the following:
doc.Descendants(s + "List")

After this minor modification everything worked exactly as expected.

Namespacin' Tom Out.

Tags

SharePoint CSharp XML LINQ

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